Valve with progressive opening which can be immobilized in a given position and cutting torch including such a valve

摘要

The valve with progressive opening comprises a shutter element (23) including a head (28) received in a ball cage (36) including at least one ball (45) selectively urged, by a ramp (incline) (46) carried by a push rod (39), into contact with a shaped peripheral surface (48) of the head (28) in order to immobilize the shutter element (23), in an unlockable fashion, in at least one opening position. Application particularly to controlling cutting oxygen of cutting torches. <IMAGE>